Concepts of Biology

This special interactive, multimedia version of the open source textbook Concepts of Biology (COB) provides an enhanced learning experience with defined terms, learner feedback, assessment, video, and animations.

Concepts of Biology is designed for the typical introductory biology course for nonmajors, covering standard scope and sequence requirements. The text includes interesting applications and conveys the major themes of biology, with content that is meaningful and easy to understand. The book is designed to demonstrate biology concepts and to promote scientific literacy.

Download COB for Windows PCs.
(After downloading, run COBWindowsSetup.exe to install.)

Download COB for Mac OS.
(After downloading, open the .dmg file, then run

Non-interactive versions of this textbook are available from openstax.
Download for free at